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  <div class="section" id="dispersed-phases-hydrate-formation-time">
<h1>dispersed_phases.hydrate_formation_time<a class="headerlink" href="#dispersed-phases-hydrate-formation-time" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="dispersed_phases.hydrate_formation_time">
<code class="sig-prename descclassname">dispersed_phases.</code><code class="sig-name descname">hydrate_formation_time</code><span class="sig-paren">(</span><em class="sig-param">dbm_obj</em>, <em class="sig-param">z</em>, <em class="sig-param">m</em>, <em class="sig-param">T</em>, <em class="sig-param">profile</em><span class="sig-paren">)</span><a class="reference internal" href="../../_modules/dispersed_phases.html#hydrate_formation_time"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#dispersed_phases.hydrate_formation_time" title="Permalink to this definition">¶</a></dt>
<dd><p>Compute the hydrate formation time</p>
<p>Computes the time to form a hydrate shell using the empirical model from
Jun et al. (2015).  If the particle is above the hydrate stability zone,
the formation time is np.inf.  If it is below the hydrate statbility
line, the maximum formation time t_star is computed based on the particle
diameter.  For high hydrate subcooling, the formation time can be 
accelerated by a factor phi = f(extent of subcooling).  The final 
hydrate formation time is t_hyd = phi * t_star.</p>
<p>The idea behind this model is that bubbles or droplets in the ocen may 
form a hydrate shell that results in dirty-bubble mass and heat transfer
and rise velocity.  This algorithm sets the time to form the shell based
on measured field data by Rehder et al. (2002).  The model has been 
validated to field data in Romer et al. (2012), McGinnis et al. (2006), 
Warkinski et al. (2014), and the GISR field experiments.</p>
<dl class="field-list">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><dl>
<dt><strong>dbm_obj</strong><span class="classifier"><cite>dbm.FluidParticle</cite> object</span></dt><dd><p>Discrete bubble model <cite>dbm.FluidParticle</cite> object.  Since this method
must calculate the hydrate stability temperature, it cannot be used
on <cite>dbm.InsolubleParticle</cite> objects.  A hydrate formation time can 
still be set for those particles, but not estimated from this 
function.</p>
</dd>
<dt><strong>z</strong><span class="classifier">float</span></dt><dd><p>Release depth (m)</p>
</dd>
<dt><strong>m</strong><span class="classifier">ndarray</span></dt><dd><p>Initial masses of the components of the <cite>dbm_obj</cite> (kg)</p>
</dd>
<dt><strong>T</strong><span class="classifier">float</span></dt><dd><p>Initial temperature of the of <cite>dbm~_obj</cite> particle (K)</p>
</dd>
<dt><strong>profile</strong><span class="classifier"><cite>ambient.Profile</cite> object</span></dt><dd><p>An object containing the ambient CTD data and associated methods.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><dl class="simple">
<dt><strong>t_hyd</strong><span class="classifier">float</span></dt><dd><p>Hydrate formation time (s)</p>
</dd>
</dl>
</dd>
</dl>
</dd></dl>

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